[Rspatial-devel] empty Spatial* objects

[Edzer Pebesma]

There was this Q on SO:

http://stackoverflow.com/questions/28527663/get-an-empty-spatialpolygonsdataframe-via-subset

asking for the possibility to create Spatial* objects without features,
like a data.frame with 0 rows.

For SpatialPointsDataFrame, these are currently allowed, e.g. by

meuse[F,]

although validObject(meuse[F,]) returns FALSE.

The reason why this currently does not work for SpatialPolygonsDataFrame
seems a programming error: it's simply overlooked.

Is there a strong reason not to allow such objects? Are there
suggestions what to do with @bbox for such objects?
-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi),  University of Münster,
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/
Spatial Statistics Society http://www.spatialstatistics.info

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